JP4048992B2

JP4048992B2 - Grommet

Info

Publication number: JP4048992B2
Application number: JP2003100809A
Authority: JP
Inventors: 裕之中田; 幸則森下
Original assignee: Sumitomo Wiring Systems Ltd
Current assignee: Sumitomo Wiring Systems Ltd
Priority date: 2003-04-03
Filing date: 2003-04-03
Publication date: 2008-02-20
Anticipated expiration: 2023-04-03
Also published as: AU2004201426B2; AU2004201426A1; JP2004312827A

Description

【０００１】
【発明の属する技術分野】
本発明はグロメットに関し、詳しくは、自動車に配索するワイヤハーネスに組みつけて、車体パネルの貫通穴に装着し、貫通穴の挿通部分におけるワイヤハーネスの保護および防水、防塵を図るものである。
【０００２】
【従来の技術】
自動車のエンジンルームから車室側へ配索されるワイヤハーネスにはグロメットを装着して、エンジンルームと車室とを仕切る車体パネルの貫通穴にグロメットを取り付けて、貫通穴を通るワイヤハーネスの保護およびエンジンルーム側から車室への防水、防塵、遮音を図っている。
【０００３】
この種のグロメットは、車体パネルの貫通穴に挿入係止するために、貫通穴に対して垂直方向に真っすぐに引っ張る場合が多いが、車体パネルの貫通穴近傍に干渉材がある場合には、真っすぐにグロメットを引っ張ることができない。
上記した場合のグロメットとして、本出願人は先に特開２００２−２３３０３５号において図４に示すグロメット１を提供している。
【０００４】
上記グロメット１は、小径筒部２と、該小径筒部２に連続した拡径筒部４を備え、該拡径筒部４の大径側に傾斜壁５ａと垂直壁５ｃとで挟んだ環状の車体係止用の溝５ｂを設け、上記小径筒部２の軸線と拡径筒部４の軸線とを屈折させると共に、上記拡径筒部外周面からの傾斜壁５ａの突出量は小径筒部２の屈折側の傾斜壁５ａ−２を小さくすると共に、反対側の傾斜壁５ａ−１の突出量は大としている。
上記グロメット１はＹ方向に引っ張って、車体パネルに設けた貫通穴の周縁部をグロメット１の車体係止用の溝５ｂに嵌め込んで、グロメット１を車体パネルに係止している。
【０００５】
【特許文献１】
特開２００２−２３３０３５号公報
【０００６】
【発明が解決しようとする課題】
しかしながら、上記グロメット１を車体パネルに係止した後、Ｙ方向と反対方向の力がグロメット１にかかると、車体係止用の溝５ｂの深さは全周均一としているので、力が伝わりやすい屈折側の車体係止用の溝５ｂ−２が貫通穴の周縁部から外れ、グロメット１が車体パネルから外れてしまうという問題がある。
また、グロメット１がＹ方向と反対方向の力により外れないようにするため、車体係止用の溝５ｂを深くすることも考えられるが、傾斜壁５ａの突出量が大きくなり、屈折側に対向する側には引っ張り力が伝わりにくいので、グロメットの挿入作業に要する挿入力が増大し、作業性が悪くなるという問題がある。
【０００７】
本発明は上記問題に鑑みてなされたものであり、グロメットの斜め挿入時に要する挿入力を低減し、かつ、車体パネルに係止したグロメットの係止力を高めることを課題としている。
【０００８】
【課題を解決するための手段】
上記課題を解決するため、本発明は、車体係止用の環状凹部を大径側に設けた拡径筒部と、該拡径筒部の縮径端に拡径筒部と軸線方向を相違させて屈曲して連続する小径筒部を備え、該小径筒部および拡径筒部にワイヤハーネスを挿通させて取り付け、上記小径筒部側を引っ張って、車体パネルの貫通穴に挿入し上記環状凹部を上記貫通穴に装着するグロメットにおいて、
上記環状凹部の底面の径は全周均一とする一方、上記環状凹部の底面を挟む両側壁のうち、縮径側の側壁は底面からの高さを周方向で相違させ、上記小径筒部の屈折側の上記縮径側の側壁の高さを、屈折側と反対側の上記側壁の高さより大としていることを特徴とするグロメットを提供している。
【０００９】
上記構成とすると、屈折側と反対側の環状凹部にはグロメットの引っ張り力が伝わりにくいが、該屈折側と反対側の縮径側の側壁の底面からの高さを小さくしているので、貫通穴の周縁部が縮径側の側壁先端を乗り越えやすくなり、小さな挿入力で貫通穴の周縁部を環状凹部に落とし込むことができる。
また、屈折側の縮径側の側壁の底面からの高さは上記屈折側と反対側の側壁の高さよりも大きくしているが、グロメットの引っ張り力が伝わりやすいため、屈折側の環状凹部に貫通穴の周縁部を落とし込むための挿入力があまり大きくならない。これにより、小さな挿入力で車体パネルの貫通穴に容易にグロメットを装着することができる。
【００１０】
また、グロメットに引っ張り方向と反対の力がかかっても、力の伝わりやすい屈折側の側壁の高さを大きくしているので貫通穴の周縁部が環状凹部から容易に外れることがない。
なお、上記屈折側とは、小径筒部と拡径筒部とが最も近接する側をいう。
【００１１】
上記環状凹部の底面からの高さを大としている縮径側の側壁先端の直径は、高さを小としている縮径側の側壁先端の直径よりも０．５〜３．０％大としていることが好ましい。
０．５％よりも小さいと縮径側の側壁を高くすることによる係止力増大の効果を十分に得ることができず、グロメットに引っ張り方向と反対の力がかかったときに貫通穴の周縁部が屈折側の環状凹部から外れやすくなるからである。また、３．０％よりも大きいと屈折側の側壁が高くなりすぎ、屈折側の環状凹部を貫通穴の周縁部に係止するための挿入力が大きくなるからである。
【００１２】
上記拡径筒部の軸線を中心として、上記屈折側の６０〜１８０°の範囲で、上記環状凹部の縮径側の側壁を高くしていることが好ましい。
６０°よりも小さいと屈折側の縮径側の側壁を高くすることによる係止力増大の効果を十分に得ることができず、グロメットに引っ張り方向と反対の力がかかったときに貫通穴の周縁部が屈折側の環状凹部から外れやすくなるからである。また、１８０°より大きいと屈折側と反対側の側壁先端の外径が大きくなってしまい、グロメットの挿入力を低減することができないためである。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照して説明する。
図１乃至図３は本発明の実施形態を示す。
グロメット１０はゴムあるいはエラストマーで一体成形し、小径筒部１２と、該小径筒部１２に連続させ、かつ、該小径筒部１２の軸線Ｒと屈折する軸線Ｘを有する拡径筒部１４と、該拡径筒部１４の大径側の外周面に設けた環状凹部１５とからなる。また、小径筒部１２の外周面と拡径筒部１４の外周面とが最も近接する屈折側に、小径筒部１２の外周面と拡径筒部１４の外周面とに連続する水かき状の三角片１３を設けている。
【００１４】
小径筒部１２は、第１の小径筒部１２ａと、該第１の小径筒部１２ａに連続する拡径段部１２ｂと、該拡径段部１２ｂに連続する第２の小径筒部１２ｃとからなり、該第１の小径筒部１２ａの内周面には環状に３つの突条部１２ｄを設けている。
【００１５】
拡径筒部１４の大径側に環状に設けている係止凹部１５は大径側に突出させた垂直壁１５ｃと、底面１５ｂを挟んで対向させた縮径側の側壁１５ａとからなる。縮径側の側壁１５ａの外周面は小径筒部１２側へ拡径するように傾斜し、縮径側の側壁１５ａの小径筒部１２側端部である縮径側の側壁先端１５ｄから小径筒部１２との連続位置まで、拡径筒部１４の外周面を縮径するように傾斜させている。垂直壁１５ｃの側面１５ｃ−１の外径端にはシールリップ１５ｃ−２を環状にグロメット１０の軸線Ｘ方向に突設している。
【００１６】
係止凹部１５の縮径側の側壁先端１５ｄは、部分的にその外径を変えている。具体的には、側壁先端１５ｄの屈折側から左右両側４５°に該当する側壁先端１５ｄ−１の外径を軸線Ｘを中心として直径７６．０ｍｍ（ｈ１＝３８．０ｍｍ）とし、該側壁先端１５ｄ−１の両端から左右両側１０°の範囲に該当する側壁先端１５ｄ−２を挟んで、残りの側壁先端１５ｄ−３の外径を軸線Ｘを中心として直径７５．０ｍｍ（ｈ２＝３７．５ｍｍ）としている。即ち、側壁先端１５ｄ−１の外径を側壁先端１５ｄ−３の外径よりも約１．３％大としている。また、底面１５ｂの径は全周均一とし、屈折側の側壁先端１５ｄ−１の外径を屈折側と反対側の側壁先端１５ｄ−３の外径よりも大きくして、屈折側の側壁高さを屈折側と反対側の側壁高さより大きくしている。
また、側壁先端１５ｄ−１と側壁先端１５ｄ−３とで挟まれた側壁先端１５ｄ−２は、側壁先端１５ｄ−１の端部と側壁先端１５ｄ−３の端部を結ぶ円弧として、側壁先端１５ｄ−１と側壁先端１５ｄ−３の径の差を矯正している。
【００１７】
次に、グロメット１０の車体パネルＰへの装着作業について説明する。
先ず、ワイヤハーネスＷ／Ｈをグロメット１０の小径筒部１２と拡径筒部１４の中空部に挿通させ、第１の小径筒部１２ａとテープＴにて固着する。
次いで、図３（Ａ）の白矢印方向に手でグロメット１０を押し潰しながら、グロメット１０の大径側から貫通穴Ｈを通して押し込み、一端、車室側（Ｎ）に移動させる。
【００１８】
次いで、図３（Ｂ）に示すように、グロメット１０の小径筒部１２側を車外側（Ｍ）へ引き戻す。この際、車体パネルＰの貫通穴Ｈの内径と同じ外径となる箇所に貫通穴Ｈの周縁部が到達するまでは、殆ど引っ張り力を必要とせず、図３（Ｃ）に示すように、貫通穴Ｈが拡径筒部１４に当接すると、そこで作業者に節度感を発生させる。
【００１９】
作業者はこの節度位置から、図３（Ｄ）に示すように、斜めに引っ張ることで、つまり、小径筒部１２の屈折側にグロメット１０を引っ張ることで、貫通穴Ｈの周縁部は側壁先端１５ｄを内方へ撓ませて側壁先端１５ｄを通過し、図３（Ｅ）に示すように、環状凹部１５に落とし込まれ縮径側の側壁１５ａと垂直壁１５ｃに挟まれるように係止される。このとき、車体パネルＰの内周面は垂直壁１５ｃのシールリップ１５ｃ−２と当接するので、防水性が確保される。
【００２０】
上記構成とすると、屈折側と反対側の側壁先端１５ｄ−３にはグロメット１０の引っ張り力が伝わりにくいが、側壁先端１５ｄ−３の外径を小さくしているので、貫通穴Ｈの周縁部が側壁先端１５ｄ−３を乗り越えやすくなり、小さな挿入力で貫通穴Ｈの周縁部を環状凹部１５に落とし込むことができる。また、屈折側の側壁先端１５ｄ−１の外径は側壁先端１５ｄ−３よりも大きくしているが、グロメット１０の引っ張り力が伝わりやすいため、屈折側の環状凹部１５に貫通穴Ｈの周縁部を落とし込むために挿入力が大きくなることがない。これにより、小さな挿入力で車体パネルの貫通穴に容易にグロメット１０を装着することができる。
また、グロメット１０に引っ張り方向と反対の力がかかっても、力の伝わりやすい屈折側の側壁先端１５ｄ−１の外径を大きくしているので貫通穴Ｈの周縁部が環状凹部１５から容易に外れることがない。
【００２１】
【発明の効果】
以上の説明より明らかなように、本発明によれば、小径筒部と拡径筒部とが屈折するグロメットにおいて、屈折側と反対側の環状凹部にはグロメットの引っ張り力が伝わりにくいが、該屈折側と反対側の縮径側の側壁先端の外径を小さくしているので、貫通穴の周縁部が側壁先端を乗り越えやすくなり、小さな挿入力で貫通穴の周縁部を環状凹部に落とし込むことができる。
また、屈折側の側壁先端の外径は屈折側と反対側の側壁先端の外径よりも大きくしているが、グロメットの引っ張り力が伝わりやすいため、屈折側の環状凹部に貫通穴の周縁部を落とし込むための挿入力が大きくなることはない。これにより、小さな挿入力で車体パネルの貫通穴に容易にグロメットを装着することができる。
また、グロメットに引っ張り方向と反対の力がかかっても、力の伝わりやすい屈折側の側壁先端の外径を大きくしているので貫通穴の周縁部が環状凹部から容易に外れることがない。
【図面の簡単な説明】
【図１】本発明の実施形態のグロメットの背面図である。
【図２】グロメットのＩ−Ｉ線断面図である。
【図３】（Ａ）〜（Ｅ）はグロメットの車体パネルへの装着手順を示した図面である。
【図４】従来例を示す図面である。
【符号の説明】
１０グロメット
１２小径筒部
１４拡径筒部
１５環状凹部
１５ａ縮径側の側壁
１５ｂ底面
１５ｃ垂直壁
１５ｄ側壁先端
Ｐ車体パネル
Ｈ貫通穴
Ｗ／Ｈワイヤハーネス[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grommet, and more particularly, to a grommet that is assembled to a wire harness routed in an automobile and attached to a through hole of a vehicle body panel to protect, waterproof, and dust proof the wire harness at a through hole insertion portion.
[0002]
[Prior art]
A grommet is attached to the wire harness routed from the engine room of the automobile to the passenger compartment, and the grommet is attached to the through hole of the vehicle body panel that separates the engine room and the passenger compartment, thereby protecting the wire harness passing through the through hole. In addition, waterproofing, dustproofing, and sound insulation from the engine room side to the vehicle compartment are made.
[0003]
This type of grommet is often pulled straight in the direction perpendicular to the through-hole in order to insert and lock it in the through-hole of the vehicle body panel, but if there is an interference material near the through-hole of the vehicle body panel, Can't pull the grommet straight.
As a grommet in the case described above, the present applicant has previously provided a grommet 1 shown in FIG. 4 in JP-A-2002-233035.
[0004]
The grommet 1 includes a small-diameter cylindrical portion 2 and a large-diameter cylindrical portion 4 continuous to the small-diameter cylindrical portion 2, and an annular shape sandwiched between an inclined wall 5a and a vertical wall 5c on the large-diameter side of the large-diameter cylindrical portion 4. The vehicle body locking groove 5b is provided to refract the axis of the small diameter cylindrical portion 2 and the axis of the large diameter cylindrical portion 4, and the protruding amount of the inclined wall 5a from the outer peripheral surface of the large diameter cylindrical portion is small. While making the inclined wall 5a-2 on the refracting side of the portion 2 small, the protruding amount of the inclined wall 5a-1 on the opposite side is made large.
The grommet 1 is pulled in the Y direction, and the periphery of a through hole provided in the vehicle body panel is fitted into the groove 5b for locking the vehicle body of the grommet 1 so that the grommet 1 is locked to the vehicle body panel.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-233035
[Problems to be solved by the invention]
However, after the grommet 1 is locked to the vehicle body panel, if a force in the direction opposite to the Y direction is applied to the grommet 1, the depth of the vehicle body locking groove 5b is uniform throughout, so that the force is easily transmitted. There is a problem that the groove 5b-2 for locking the vehicle body on the refraction side is disengaged from the peripheral portion of the through hole, and the grommet 1 is disengaged from the vehicle body panel.
Further, in order to prevent the grommet 1 from coming off due to the force in the direction opposite to the Y direction, it may be possible to deepen the groove 5b for locking the vehicle body. However, the protruding amount of the inclined wall 5a increases, and it faces the refracting side. Since the pulling force is difficult to be transmitted to the side where the grommet is inserted, there is a problem that the insertion force required for the grommet insertion operation is increased and workability is deteriorated.
[0007]
This invention is made | formed in view of the said problem, and makes it the subject to reduce the insertion force required at the time of diagonal insertion of a grommet, and to raise the locking force of the grommet locked to the vehicle body panel.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is different in the axial direction from the enlarged diameter cylindrical portion provided with an annular concave portion for locking the vehicle body on the larger diameter side and the reduced diameter end of the enlarged diameter cylindrical portion. A small-diameter cylindrical portion that is bent and continuous, and is attached by inserting a wire harness through the small-diameter cylindrical portion and the large-diameter cylindrical portion, pulling the small-diameter cylindrical portion side, and inserting it into the through hole of the vehicle body panel. In the grommet that attaches the recess to the through hole,
While the diameter of the bottom surface of the annular recess is uniform over the entire circumference, the side walls on the reduced diameter side of the both side walls sandwiching the bottom surface of the annular recess have different heights from the bottom surface in the circumferential direction. the height of the sidewall of the reduced diameter side of the refraction side provides a grommet to the other side of said large cities Tei Rukoto than the height of the side wall and the refraction side.
[0009]
With the above configuration, the grommet pulling force is difficult to be transmitted to the annular recess on the opposite side to the refracting side, but the height from the bottom surface of the reduced diameter side wall opposite to the refracting side is reduced. The peripheral edge of the hole can easily get over the tip of the reduced diameter side wall, and the peripheral edge of the through hole can be dropped into the annular recess with a small insertion force.
In addition, the height from the bottom surface of the side wall on the reduced diameter side on the refracting side is larger than the height of the side wall on the opposite side to the refracting side, but because the tensile force of the grommet is easily transmitted, The insertion force for dropping the peripheral edge of the through hole is not so great. Accordingly, the grommet can be easily attached to the through hole of the vehicle body panel with a small insertion force.
[0010]
Even when a force opposite to the pulling direction is applied to the grommet, the peripheral side portion of the through hole is not easily detached from the annular recess because the height of the side wall on the refractive side where the force is easily transmitted is increased.
In addition, the said refractive side means the side where a small diameter cylinder part and an enlarged diameter cylinder part adjoin most.
[0011]
The diameter of the side wall tip on the reduced diameter side that increases the height from the bottom surface of the annular recess is 0.5 to 3.0% larger than the diameter of the side wall tip on the reduced diameter side that decreases the height. It is preferable.
If it is smaller than 0.5%, the effect of increasing the locking force by increasing the side wall on the reduced diameter side cannot be obtained sufficiently, and the perimeter of the through hole when a force opposite to the pulling direction is applied to the grommet This is because the portion is easily detached from the annular concave portion on the refraction side. On the other hand, if the ratio is larger than 3.0%, the side wall on the refraction side becomes too high, and the insertion force for locking the annular recess on the refraction side to the peripheral portion of the through hole becomes large.
[0012]
The side wall on the reduced diameter side of the annular recess is preferably made higher in the range of 60 to 180 ° on the refracting side with the axis of the enlarged diameter cylindrical portion as the center.
If the angle is smaller than 60 °, the effect of increasing the locking force by increasing the side wall on the reduced diameter side on the refracting side cannot be obtained sufficiently, and when the grommet is subjected to a force opposite to the pulling direction, This is because the peripheral edge portion is easily detached from the annular concave portion on the refraction side. On the other hand, if the angle is larger than 180 °, the outer diameter of the tip of the side wall opposite to the refracting side becomes large, and the grommet insertion force cannot be reduced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of the present invention.
The grommet 10 is integrally formed of rubber or elastomer, has a small-diameter cylindrical portion 12, a large-diameter cylindrical portion 14 that is continuous with the small-diameter cylindrical portion 12 and has an axis X that is refracted from the axis R of the small-diameter cylindrical portion 12. It consists of the annular recessed part 15 provided in the outer peripheral surface of the large diameter side of this enlarged diameter cylinder part 14. As shown in FIG. Further, a web-like shape that is continuous with the outer peripheral surface of the small-diameter cylindrical portion 12 and the outer peripheral surface of the large-diameter cylindrical portion 14 on the side of refraction where the outer peripheral surface of the small-diameter cylindrical portion 12 and the outer peripheral surface of the enlarged-diameter cylindrical portion 14 are closest A triangular piece 13 is provided.
[0014]
The small-diameter cylindrical portion 12 includes a first small-diameter cylindrical portion 12a, an enlarged diameter step portion 12b continuous with the first small-diameter cylindrical portion 12a, and a second small-diameter cylinder portion 12c continuous with the enlarged diameter step portion 12b. The first small-diameter cylindrical portion 12a is provided with three ridges 12d in an annular shape on the inner peripheral surface.
[0015]
The locking recess 15 provided annularly on the large diameter side of the enlarged diameter cylindrical portion 14 includes a vertical wall 15c protruding to the large diameter side and a reduced diameter side wall 15a opposed to each other across the bottom surface 15b. The outer peripheral surface of the reduced-diameter side wall 15a is inclined so as to increase in diameter toward the small-diameter cylindrical portion 12 side, and from the reduced-diameter side wall tip 15d, which is the end portion on the small-diameter cylindrical portion 12 side of the reduced-diameter side wall 15a. The outer peripheral surface of the enlarged diameter cylindrical portion 14 is inclined so as to reduce its diameter up to a continuous position with the portion 12. A seal lip 15c-2 is provided annularly in the axial direction of the grommet 10 at the outer diameter end of the side surface 15c-1 of the vertical wall 15c.
[0016]
The outer diameter of the side wall tip 15d on the reduced diameter side of the locking recess 15 is partially changed. Specifically, the outer diameter of the side wall tip 15d-1 corresponding to 45 ° from the side of the side wall tip 15d to the left and right sides is set to a diameter of 76.0 mm (h1 = 38.0 mm) about the axis X, and the side wall tip 15d. −1, the outer diameter of the remaining side wall tip 15d-3 is 75.0 mm (h2 = 37.5 mm) centering on the axis X, with the side wall tip 15d-2 corresponding to a range of 10 ° on both the left and right sides. It is said. That is, the outer diameter of the side wall tip 15d-1 is about 1.3% larger than the outer diameter of the side wall tip 15d- 3 . Further, the diameter of the bottom surface 15b is uniform over the entire circumference, and the outer diameter of the side wall tip 15d-1 on the refraction side is made larger than the outer diameter of the side wall tip 15d-3 on the side opposite to the refraction side. Is made larger than the side wall height on the side opposite to the refractive side.
The side wall tip 15d-2 sandwiched between the side wall tip 15d-1 and the side wall tip 15d-3 is a side wall tip 15d as an arc connecting the end of the side wall tip 15d-1 and the end of the side wall tip 15d-3. -1 and the diameter difference between the side wall tip 15d-3 are corrected.
[0017]
Next, the mounting operation of the grommet 10 to the vehicle body panel P will be described.
First, the wire harness W / H is inserted into the hollow portions of the small diameter cylindrical portion 12 and the enlarged diameter cylindrical portion 14 of the grommet 10 and fixed to the first small diameter cylindrical portion 12a with the tape T.
Next, while the grommet 10 is crushed by hand in the direction of the white arrow in FIG. 3 (A), the grommet 10 is pushed in from the large diameter side of the grommet 10 through the through hole H, and is moved to the vehicle interior side (N).
[0018]
Next, as shown in FIG. 3B, the small-diameter cylindrical portion 12 side of the grommet 10 is pulled back to the vehicle outer side (M). At this time, almost no pulling force is required until the peripheral portion of the through hole H reaches a portion having the same outer diameter as the inner diameter of the through hole H of the vehicle body panel P. As shown in FIG. When the through hole H comes into contact with the diameter-expanded cylindrical portion 14, a feeling of moderation is generated there.
[0019]
As shown in FIG. 3 (D), the operator pulls the grommet 10 obliquely from the moderation position, that is, pulls the grommet 10 to the refracting side of the small-diameter cylindrical portion 12, so that the peripheral portion of the through hole H is at the tip of the side wall. 3d is bent inward, passes through the side wall tip 15d, and as shown in FIG. 3 (E), is dropped into the annular recess 15 so as to be sandwiched between the reduced diameter side wall 15a and the vertical wall 15c. The At this time, the inner peripheral surface of the vehicle body panel P is in contact with the seal lip 15c-2 of the vertical wall 15c, so that waterproofness is ensured.
[0020]
With the above configuration, the pulling force of the grommet 10 is difficult to be transmitted to the side wall tip 15d-3 opposite to the refracting side, but since the outer diameter of the side wall tip 15d-3 is reduced, the peripheral portion of the through hole H is It becomes easy to get over the side wall tip 15d-3, and the peripheral edge of the through hole H can be dropped into the annular recess 15 with a small insertion force. Further, the outer diameter of the side wall tip 15d-1 on the refraction side is larger than that of the side wall tip 15d-3, but since the tensile force of the grommet 10 is easily transmitted, the peripheral portion of the through hole H is inserted into the annular recess 15 on the refraction side. The insertion force does not increase to drop Thereby, the grommet 10 can be easily mounted in the through hole of the vehicle body panel with a small insertion force.
Further, even when a force opposite to the pulling direction is applied to the grommet 10, the outer diameter of the side end 15d-1 on the refraction side where force is easily transmitted is increased, so that the peripheral portion of the through hole H can be easily removed from the annular recess 15. It will not come off.
[0021]
【The invention's effect】
As is clear from the above explanation, according to the present invention, in the grommet in which the small diameter cylindrical portion and the large diameter cylindrical portion are refracted, the tensile force of the grommet is not easily transmitted to the annular concave portion on the opposite side to the refractive side. Since the outer diameter of the side wall tip on the diameter-reduced side opposite to the refracting side is made smaller, the peripheral edge of the through hole can easily get over the front end of the side wall, and the peripheral edge of the through hole can be dropped into the annular recess with a small insertion force. Can do.
The outer diameter of the tip of the side wall on the refracting side is larger than the outer diameter of the tip of the side wall on the side opposite to the refracting side, but since the pulling force of the grommet is easy to be transmitted, The insertion force to drop the will not increase. Accordingly, the grommet can be easily attached to the through hole of the vehicle body panel with a small insertion force.
Even when a force opposite to the pulling direction is applied to the grommet, the outer diameter of the end of the side wall on the refraction side where force is easily transmitted is increased, so that the peripheral edge of the through hole is not easily detached from the annular recess.
[Brief description of the drawings]
FIG. 1 is a rear view of a grommet according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the grommet taken along line II.
FIGS. 3A to 3E are diagrams showing a procedure for mounting a grommet on a vehicle body panel. FIGS.
FIG. 4 is a diagram showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Grommet 12 Small diameter cylinder part 14 Diameter expansion cylinder part 15 Annular recessed part 15a Side wall 15b by the side of reduction diameter Bottom surface 15c Vertical wall 15d Side wall tip P Body panel H Through hole W / H Wire harness

Claims

車体係止用の環状凹部を大径側に設けた拡径筒部と、該拡径筒部の縮径端に拡径筒部と軸線方向を相違させて屈曲して連続する小径筒部を備え、該小径筒部および拡径筒部にワイヤハーネスを挿通させて取り付け、上記小径筒部側を引っ張って、車体パネルの貫通穴に挿入し上記環状凹部を上記貫通穴に装着するグロメットにおいて、
上記環状凹部の底面の径は全周均一とする一方、上記環状凹部の底面を挟む両側壁のうち、縮径側の側壁は底面からの高さを周方向で相違させ、上記小径筒部の屈折側の上記縮径側の側壁の高さを、屈折側と反対側の上記側壁の高さより大としていることを特徴とするグロメット。A diameter-enlarging cylindrical part provided with an annular recess for locking the vehicle body on the large-diameter side, and a diameter- reducing end of the diameter-enlarging cylindrical part, and a small-diameter cylindrical part that is bent and continued in a different axial direction from the diameter-enlarging cylindrical part. A grommet for inserting and attaching the wire harness to the small-diameter cylindrical portion and the large-diameter cylindrical portion, pulling the small-diameter cylindrical portion side, and inserting the annular recess into the through-hole by inserting the through-hole in the vehicle body panel.
While the diameter of the bottom surface of the annular recess is uniform over the entire circumference, the side walls on the reduced diameter side of the both side walls sandwiching the bottom surface of the annular recess have different heights from the bottom surface in the circumferential direction. the height of the sidewall of the reduced diameter side of the refraction side, the grommet to the other side of said large cities Tei Rukoto than the height of the side wall and the refraction side.